Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c66406489ca81c…

MALICIOUS

PDF

133.1 KB Created: 2021-06-30 17:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 00d125a39ad40f3ef23d43edaa673eec SHA-1: 6e81e3242a4ef1674ca492b12e70d0cdc6f5add7 SHA-256: 83c66406489ca81c79c8ea472a3a315458dfc4f29832e66327d9d14514e04470
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=product+manufacturers+list PDF link annotation
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/rojjop4eljfb9j3pg3c9urld26/37600616412.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160852c897447f---zudebonozavajebijuzif.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210515193751.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b72f8c8394c---nezufu.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ee5db86f7---49972244500.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/39298346355.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/40057883286.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/adc986cc71fae32b1cdd666794f1e3fa/62012892382.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098376c33a05---vegegefotumezovobunulale.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/10539670913.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/28f7f40c77d809c7345a5846d81ce466/27950625523.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b81b609e872---83707057713.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160acc6b1e4be6---79376141283.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/newaviniruvuruleziweliti.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/raxivigugunuzetawotilo.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e5d9bdb4ffd520e0d8bdf2eb95a9bb60/21838258988.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/5039bd7f4f16a1df352868bbaf012477/vidodozid.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/52168408129.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8dbcc4714---4959233609.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160986eb2d60e6---35876677330.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5bd0a1a7520c58da73905c47c985589d/debitivoriremoj.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f10316796---1904622261.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/30916694352.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A806 10736 bytes
SHA-256: eabb0c8b3469c43ffedb62a5c2c885d9fc29d359b9cc4263f52f7e944da86cec
font_01_sfnt_off0001c0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8C2 17560 bytes
SHA-256: b67b00e8b17db52eb91d7603bf36e37050bdcdd0ed167a5b462a9e2afc048b2b